The Ruler is an accessory that can be purchased from the Goblin Tinker, provided he is released after defeating the Goblin Army.

This item is equipped in one of a players' five accessory slots, and creates a non-solid, white grid on the screen, in measurements of 1x1 blocks, meaning that players can easily calculate the width and height, as well as areas, of buildings/structures, etc. It offers no bonuses to the player, aside from altering their display quite drastically.